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Renesas X4043S8I-2.7
- Part No.:
- X4043S8I-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X4043S8I-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
X4043S8I-2.7 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit serial EEPROM in a single 8-pin SOIC package. It features active-low open-drain RESET output, 2.7V–5.5V operation, 2.55V–2.7V reset threshold, and I²C-compatible 2-wire interface - used for microcontroller system reliability in industrial embedded controllers.
For engineers reviewing the X4043S8I-2.7 datasheet, X4043S8I-2.7 pinout, X4043S8I-2.7 application, or X4043S8I-2.7 equivalent, key selection considerations include VTRIP programmability, Block Lock™ EEPROM protection granularity, watchdog timeout configurability (200ms/600ms/1.4s), and compatibility with legacy I²C bus timing at 400kHz.
Technical Context
The X4043S8I-2.7 implements a dual-function reset architecture: power-on reset with 250ms delay and brownout detection asserting RESET below 2.55V–2.7V (factory-set, reprogrammable). Its watchdog timer monitors SDA/SCL activity and triggers reset if no valid I²C transaction occurs within the selected timeout interval.
Internally, it combines a CMOS serial EEPROM array organized as 512 × 8 bits with Intersil's Direct Write™ memory cells (1M write cycles, 100-year retention), block lock protection controlled by nonvolatile BP2–BP0 bits, and a software-configurable control register accessed via slave address 0xB0 (10110000b) at 1FFh.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 5.5V - supports wide-input industrial power rails without external regulation. |
| VTRIP Threshold | 2.55V to 2.7V - factory-programmed low-voltage reset point, reprogrammable via high-voltage WP sequence. |
| Reset Output | Active-low open-drain RESET - requires external pull-up; asserts down to VCC = 1V and holds for tPURST ≥ 200ms after recovery. |
| Watchdog Timeout | Selectable: 200ms / 600ms / 1.4s - set via nonvolatile WD1/WD0 bits; disabled by default. |
| EEPROM Capacity | 4kbit (512 × 8) - organized in 16-byte pages; supports byte and page writes with self-timed 5ms typical cycle time. |
| I²C Interface | 400kHz max clock rate - fully compatible with standard-mode I²C buses; uses SDA/SCL with open-drain drivers and mandatory pull-ups. |
| Standby Current | <1µA (watchdog OFF) / <20µA (watchdog ON) - enables ultra-low-power battery-backed operation. |
Pinout & Package
Package: 8-pin JEDEC SOIC (3.9mm × 4.9mm), RoHS-compliant Pb-free plus anneal finish, -40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left unconnected; not usable as grounds or bypass points. |
| 3 | RESET | Active-low open-drain reset output - asserts during power-up, brownout (VCC < VTRIP), or watchdog timeout; requires external pull-up resistor. |
| 4 | VSS | Ground reference - primary return path for all internal circuits and I²C interface. |
| 5 | SDA | Serial data bidirectional I/O - open-drain, wire-OR capable; carries command/data/address and watchdog restart signals. |
| 6 | SCL | Serial clock input - controls I²C timing; monitored by watchdog for activity detection. |
| 7 | WP | Write protect input - HIGH disables all writes (EEPROM and control register); also used for VTRIP programming with 15–18V pulse. |
| 8 | VCC | Supply voltage input - powers all functions; voltage level determines reset assertion and VTRIP calibration reference. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VTRIP | Voltage threshold adjustable via high-voltage WP pulse - enables precise brownout tuning without hardware changes. |
| Block Lock™ Protection | Eight configurable protection modes (0–128 bytes, 1/4–full array) - prevents inadvertent firmware or calibration data overwrite. |
| Self-Timed EEPROM Writes | 5ms typical write cycle - eliminates need for external timing control; status verified via acknowledge polling. |
| Power-Up Reset Timing | 250ms fixed delay - ensures stable VCC and oscillator startup before processor release. |
| Low-Voltage Operation | RESET remains valid down to VCC = 1V - guarantees fail-safe behavior during deep brownout conditions. |
Applications
| Industrial PLC Controller | Medical Sensor Module |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controller monitoring motor drives and safety interlocks in factory automation. IC Role / Device Role / Timing Role: CPU supervisor providing power-on reset, brownout protection, and watchdog supervision - ensures deterministic boot and fault recovery. Use Value: Prevents erratic operation during line sags; EEPROM stores calibrated sensor offsets and runtime configuration with Block Lock™ preventing corruption during EMI events. |
Use Scenario: Portable patient monitor acquiring ECG, SpO₂, and temperature data with local storage and wireless upload. IC Role / Device Role / Timing Role: System supervisor managing MCU reset integrity and storing calibration coefficients and device ID in protected EEPROM. Use Value: Guarantees safe shutdown during battery depletion (VCC < 2.55V); 1µA standby current extends battery life between calibrations. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: ANSI C12.22-compliant electricity meter logging consumption data and tariff schedules across power cycles. IC Role / Device Role / Timing Role: Supervisory IC ensuring reliable MCU initialization and preserving tamper-proof billing parameters in EEPROM. Use Value: VTRIP reprogrammability allows precise match to meter's 3.3V LDO tolerance; Block Lock™ protects revenue-critical registers from firmware update errors. |
Use Scenario: CAN-connected BCM managing door locks, lighting, and window controls in passenger vehicles. IC Role / Device Role / Timing Role: Reset manager and nonvolatile parameter store - handles cold crank (low-VCC) immunity and retains user preferences. Use Value: RESET assertion down to 1V prevents latch-up during cranking transients; EEPROM endurance (1M cycles) supports frequent firmware updates and diagnostics logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPU supervisor with EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA29+T | Fixed 2.93V reset threshold; no VTRIP programmability; 1kbit EEPROM; same 8-pin SOIC package. | Lacks field-adjustable brownout point; lower EEPROM density limits configuration storage depth. | Choose when fixed threshold suffices and cost sensitivity outweighs flexibility needs. |
| STM8T142M2U6 | Integrated 8-bit MCU core; 2.5V–5.5V; 2.63V reset; 2kbit EEPROM; different 8-pin TSSOP package. | Requires firmware development; adds processing capability but increases BOM complexity and validation scope. | Prefer when on-device decision logic (e.g., adaptive watchdog) is required beyond basic supervision. |
Compared with X4043S8I-2.7, MAX6361KA29+T offers simpler qualification but no VTRIP tuning, while STM8T142M2U6 embeds intelligence at the cost of design effort and footprint mismatch - X4043S8I-2.7 uniquely balances field-programmable supervision, robust EEPROM protection, and drop-in SOIC compatibility.
Availability
X4043S8I-2.7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor modules, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for X4043S8I-2.7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil Corporation, now part of Renesas Electronics, designs high-performance analog and power management ICs for industrial, computing, and communications systems.
The X4043/X4045 family was developed to consolidate reset, watchdog, voltage monitoring, and EEPROM into one die - targeting space-constrained, reliability-critical embedded systems where board area and failure mode mitigation are paramount.
FAQ
What is the factory-default VTRIP setting for X4043S8I-2.7?
The X4043S8I-2.7 ships with a factory-programmed VTRIP range of 2.55V to 2.7V, optimized for 2.7V–5.5V supply operation. This threshold is reprogrammable using a 15–18V pulse on the WP pin and specific I²C command sequences documented in the FN8118 datasheet. The X4043S8I-2.7 maintains this setting across temperature and lifetime unless actively modified.
Does X4043S8I-2.7 support I²C standard-mode or fast-mode timing?
X4043S8I-2.7 supports I²C standard-mode operation up to 400kHz - compliant with SMBus 2.0 electrical specifications. It does not support fast-mode (1MHz) or high-speed mode. The SDA and SCL pins require external pull-up resistors, and the device responds to slave address 0xA0 (10100000b) for EEPROM access and 0xB0 (10110000b) for control register access.
How is EEPROM write protection implemented in X4043S8I-2.7?
X4043S8I-2.7 implements multi-layer EEPROM write protection: hardware-level via the WP pin (HIGH disables all writes), and software-level via three nonvolatile Block Protect bits (BP2–BP0) that lock 0, 16, 32, 64, 128, or up to 512 bytes. These settings persist through power cycles and are configured through the control register at address 1FFh using a three-step write sequence.
Can the watchdog timer in X4043S8I-2.7 be disabled after power-up?
Yes - the watchdog timer in X4043S8I-2.7 is disabled by default (WD1=1, WD0=1) and can be enabled or reconfigured via the nonvolatile control register. Once enabled, its timeout period (200ms/600ms/1.4s) remains fixed until rewritten. Disabling requires writing '11' to WD1/WD0 bits, and the setting survives power cycling - no external hardware change is needed to alter watchdog behavior.
What is the minimum VCC level at which X4043S8I-2.7 guarantees RESET assertion?
X4043S8I-2.7 guarantees RESET assertion down to VCC = 1V - meaning the output remains active even during severe brownout or battery-depletion scenarios. RESET deasserts only after VCC rises above the programmed VTRIP threshold and remains stable for ≥200ms (tPURST), ensuring clean system recovery without oscillation.
X4043S8I-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.62V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
X4043S8I-2.7 FAQ
1.How can I place an order for X4043S8I-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4043S8I-2.7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for X4043S8I-2.7 reliable?
The price and inventory of X4043S8I-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4043S8I-2.7 is usually 5 days.
3.What payment methods are accepted for X4043S8I-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4043S8I-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4043S8I-2.7?
X4043S8I-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4043S8I-2.7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for X4043S8I-2.7?
For technical support, including X4043S8I-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4043S8I-2.7 requirements.
6.How does Aetrix verify that X4043S8I-2.7 is sourced from the original manufacturer or authorized distributors?
All X4043S8I-2.7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that X4043S8I-2.7 meets industry standards.
7.What is the process for return or replacement of X4043S8I-2.7?
All X4043S8I-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4043S8I-2.7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The X4043S8I-2.7 part is unused and in its original packaging.
Return procedure for X4043S8I-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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